BMW X1 MoT advisory - what does it mean?

The MoT advisory on my 2012 BMW X1 states 'offside rear outer drive shaft inner boot liner clip loose' and 'slight click noise to wheel when rotated'. Garage started talking about £600 plus labour to fix it. What does the advisory mean? And what should I do in the meantime?
They say the gaiter is loose and that there is wear in the splined shaft. Since it's an advisory you can carry on driving and get a second opinion somewhere else. Obviously it would make sense to secure the loose clip.
Answered by Honest John on

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